Northern Ari Atoll or Alifu Alifu Atoll is an administrative division of the Maldives. It was created on March 1, 1984 combining northern section of Ari Atoll, the small Rasdhukuramathi Atoll, and the isolated island of Thoddoo. Many of the islands in this atoll have been inhabited since ancient times and have arqueological remains from the Maldivian Buddhist period. Rasdhu Atoll is also known as Ross Atoll in the Admiralty charts. The separation of Ari Atoll (formerly Alifu Atoll) into a Northern and a Southern section has formed the two most recent administrative divisions of the Maldives, namely Alifu Alifu Atoll and Alifu Dhaalu Atoll. The island of Maalhos is geographically the westernmost island of the Atoll (and the second most westerly inhabited island of the Maldives after Maamakunudhoo). Vajrayana Buddhist remains have been found on this island.